The Aquatic Plant Elodea Is Commonly Used to Study Photosynthesis

The aquatic plant Elodea is commonly used to study photosynthesis. You put some Elodea in a test tube filled with water containing radiolabeled oxygen (¹⁸O) , shine light on the test tube, and measure the rate of photosynthesis by counting oxygen bubbles released. At the end of your experiment, you would find the most ¹⁸O in

A) in ATP.
B) O₂.
C) carbon dioxide.
D) glucose.
E) in water for the most part, as water is not used in photosynthesis.